Abstract
A complete set of spin-averaged parameters, including the differential cross sections and three Stokes parameters, were obtained from a series of superelastic scattering experiments on the 4 2P state in potassium. The four scattering parameters have been measured at an effective electron energy of 54.4 eV on the ground state and over an angular range from 0° to 145°. The experimental results are compared with a convergent close-coupling (CCC) calculation and several distorted-wave calculations together with previously reported measured differential cross sections. The excellent agreement between the CCC theory and the present measurements resolves a long-standing anomaly between theory and experiment at this energy in potassium.
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